OK, let's work through this together. We're starting with 434 and we're going to multiply it by 28, which means we add 434 to itself 28 times.
Step 1: 0 + 434 = 434
Step 2: 434 + 434 = 868
Step 3: 868 + 434 = 1302
Step 4: 1302 + 434 = 1736
Step 5: 1736 + 434 = 2170
Step 6: 2170 + 434 = 2604
Step 7: 2604 + 434 = 3038
Step 8: 3038 + 434 = 3472
Step 9: 3472 + 434 = 3906
Step 10: 3906 + 434 = 4340
Step 11: 4340 + 434 = 4774
Step 12: 4774 + 434 = 5208
Step 13: 5208 + 434 = 5642
Step 14: 5642 + 434 = 6076
Step 15: 6076 + 434 = 6510
Step 16: 6510 + 434 = 6944
Step 17: 6944 + 434 = 7378
Step 18: 7378 + 434 = 7812
Step 19: 7812 + 434 = 8246
Step 20: 8246 + 434 = 8680
Step 21: 8680 + 434 = 9114
Step 22: 9114 + 434 = 9548
Step 23: 9548 + 434 = 9982
Step 24: 9982 + 434 = 10416
Step 25: 10416 + 434 = 10850
Step 26: 10850 + 434 = 11284
Step 27: 11284 + 434 = 11718
Step 28: 11718 + 434 = 12152

So, 434*28 = 12152